Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 30 for “"Species Distribution Modeling"”.
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Species Distribution Modeling for Arid Adapted Habitat Specialists in Zion National Park
… The machine learning method, MaxEnt, constructed species distribution models (SDMs) in ZION for the two study species at 30 m and 900 m spatial resolutions using climate, topographic, and remotely sensed data. Additionally, 900 m forecasting models were constructed to observe the shifts in …
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Prioritization of conservation areas using species distribution modeling based on current data of butterflies in Johor
Rapid disappearance of habitats and species justifies the need to study species range and distributions so that high-priority conservation areas can be identified. Species distribution modeling (SDM) is an approach that can overcome the time and budget constraints of protected area management. This …
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Using Species Distribution Modeling to Assess Illegal Trade Risk: A Case Study of US Imports of Endangered Mahogany (Swietenia spp.)
… and the global conservation of endangered species. To protect tree species from this threat, governments have enacted legislation against importing illegally sourced plant products. These laws, including the US Lacey Act Amendment of 2008, involve collecting information from importers on …
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The vascular flora and species distribution modeling of two rare species in Cloudland Canyon State Park, Dade and Walker Counties, Georgia
… records resulting in the documentation of 665 species and subspecific taxa, representing 361 genera in 122 families. The top three most represented families were Asteraceae (99 taxa; 14.9%), Poaceae (64; 9.6%), and Cyperaceae (52; 7.8%). Twenty-eight rare species were documented, including 10 …
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Using Remote Sensing and Biogeographic Modeling to Understand the Oak Savannas of the Sheyenne National Grassland, North Dakota, USA
… the landscape scale. In this research, I map the distribution patterns of oak savanna in the Sheyenne using a combination of remote sensing and geospatial datasets, including landscape topography, soils, and fire disturbance. Further, I interpret the performance of a suite of advanced Species …
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Distributional Modeling Of Rare Fishes And Mussels: From Ecological Theory To Biodiversity Conservation
… across North America. Nearly 50% of the mussel species and 25% of the fish species in North America are imperiled. Stream habitat degradation has been cited as the principal cause for declines, with anthropogenic land uses being the leading causes of stream degradation. Species distribution …
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CLIMATE DRIVEN RANGE SHIFTS OF NORTH AMERICAN SMALL MAMMALS: SPECIES’ TRAITS AND PHYLOGENETIC INFLUENCES
… at an unprecedented rate. In response, species’ ranges may shift, tracking optimal climatic conditions. Species-specific differences may produce predictable differences in the extent of range shifts. I evaluated if patterns of predicted responses to climate change were strongly related …
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Comparative Phylogeography of Glassfrogs (Vitreorama) Endemic to the Brazilian Altantic Rainforest
… world, including 2-3% of all known vertebrate species. Understanding the role of both climate and landscape in shaping current biodiversity patterns has been the focus of many recent phylogeographic studies. Here I explore multiple factors thought to have impacted the generation of local …
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Species response to shifting and variable climates
… and postglacial colonization of an alder (Alnus) species complex (n = 3 taxa) from this vast region. Using high-throughput DNA sequencing, hindcast Species Distribution Modeling, and a reassessment of pollen records, I found evidence that Alnus expanded from several population nuclei (i.e. …
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The impacts of voluntary private lands programs on stream fish diversity in the Kaskaskia River Basin, Illinois
Freshwaters support over 40% of fish species diversity, as well as one-third of all vertebrate species, yet remain one of the most threatened habitats globally. Anthropogenic disturbances have caused many negative impacts throughout history, and continue to do so today. After the dust bowl we began …
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Looking into the Past: The Diversification of Amphibians in the Neotropical Savannas
… biome-specific yet widely distributed amphibian species (<em>Chiasmocleis albopunctata, Dendropsophus rubicundulus</em> and <em>Physalaemus nattereri</em>). Location: Cerrado region, central South America. Methods: I sampled thousands of loci randomly distributed throughout the genomes of all …
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Applying new aquatic habitat data to manage invasive and imperiled crayfishes in North America
… to better characterize freshwater habitat in modeling applications. My research applies these new freshwater GIS data layers to species distribution modeling (SDM) with implications for management of both imperiled and invasive freshwater crayfishes. In Chapter 2, I developed SDMs to …
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The distribution and ecology of invasive ant species in the Pacific region
Invasive ant species represent a major threat to biodiversity through their detrimental impacts on native ecosystems. An important step to managing invasive ant species is determining the factors responsible for their current and potential distribution. This thesis examines the spatial distribution …
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Phylogenetic Niche Modeling
… through time is a common goal when studying species response to climatic change. Species distribution models (SDMs) are commonly used to estimate a species' niche from observed patterns of occurrence and environmental predictors. However, a species niche is also shaped by non-environmental …
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Fantastic Birds and Where to Find Them
… the nonbreeding habitat of the western subspecies of Willow Flycatchers (Empidonax traillii subspp.), including the federally endangered Southwestern Willow Flycatcher (Empidonax traillii extimus), with a range-wide species distribution model. The three western subspecies of Willow …
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Modeling Point Patterns, Measurement Error and Abundance for Exploring Species Distributions
… of the statistical methodology, lies spatial modeling that provides greater flexibility and improved predictive performance over existing algorithms. The applications involve prevalence datasets for hundreds of plants over a large area in the Cape Floristic Region (CFR) of South …
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A “Neighborhood” Approach for Using Remotely Sensed Data to Post-Process Species Distribution Models for Conservation Assessments
<p>Species distribution models can be used to predict environmental suitability, estimate changes in species’ geographic ranges, and support conservation assessments. Masking suitability maps built from these models to remove areas currently lacking appropriate vegetation can refine predictions and …
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From Small to Large: Modeling at the Scale of Ecological Processes to Understand Temperate Forest Range Limits, Biomass, and Traits
… In this dissertation, I employ novel statistical modeling on continent-spanning observational datasets, national forest inventories from temperate regions, with the aim to understand how forest communities may respond to future climate. In each chapter, the methodological focus on scale is …
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Using a multi-dimensional approach to determine the conservation and taxonomic statuses of two rare crayfishes in northern Arkansas
… Cambarus causeyi and C. hubbsi are classified as Species of Greatest Conservation Need in Arkansas, and they are both endemic to Ozarks of North America. The relatively small range and rarity of these species makes them vulnerable to extinction, and both have knowledge gaps that need to be …
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